mole fraction in the liquid in the distillation flask. These values can be determined from the refractive in- dex. The relative volatility (separation ratio) α is 1.07 for a mixture of methyl cyclohexane and n-heptane. The number of theoretical trays can be calculated taking the logarithm of (6).
How do you choose light and heavy key components?
If you line up all the components in the order of their boiling points, and draw a line between two of them, the more volatile component is called the light key and the less volatile component is called the heavy key.
How do you calculate relative volatility for a multicomponent?
must be calculated.
- Total number of trays.
- Reflux ratio.
- Reboil ratio (ratio of vapor produced by the. reboiler to residue withdrawn)
- Concentration of one component in one product. (a maximum of two may be chosen)
- Ratio of flow of one component in the distillate.
- Ratio of total distillate to total residue.
Can the Fenske equation be modified for gas chromatography?
The above Fenske equation can be modified for use in the total reflux distillation of multi-component feeds. A derivation of another form of the Fenske equation for use in gas chromatography is available on the U.S. Naval Academy’s web site.
What is the Fenske equation in continuous fractional distillation?
The Fenske equation in continuous fractional distillation is an equation used for calculating the minimum number of theoretical plates required for the separation of a binary feed stream by a fractionation column that is being operated at total reflux (i.e., which means that no overhead product distillate is being withdrawn from the column).
Who derived the Fenske equation?
The equation was derived by Merrell Fenske in 1932 , a professor who served as the head of the chemical engineering department at the Pennsylvania State University from 1959 to 1969. This is one of the many different but equivalent versions of the Fenske equation:
